Stratigraphy and sedimentary evolution of the upper Oxfordian-lower Tithonian in Rida (Zaragoza)

The Upper Jurassic of Rida consists of three depositional sequences. The HST of the lower one (Oxfordian Sequence) corresponds to the marls and marly limestone and sandstone of the lower part of the Sot de Chera Fm. The reported data and the correlation to proximaler areas of the basin allows to precise the age of the upper boundary of the sequence (topmost Planula Subbiozone,). The identification of an unconformity on top of the Rida Mb (middle part of the Loriguilla Fm) allows to differentiate two sequences (Kimmeridgian sequence-1 and Kimmeridgian sequence-2), in which the TST and the HST have been recognized. The age of the boundary between both sequences is located in the middle late Kimmeridgia

The Subfamily Ataxioceratinae (Ammonoidea) from Upper Oxfordian of the Submediterranean Province: origin and evolution

The subfamily Ataxioceratinae Buckman arises at the turn of the Middle-Upper Oxfordian (Upper Jurassic) in the South-European Platform, spreading mostly throughout the Submediterranean province during Upper Oxfordian-Lower Kimmeridgian times. The genus Orthosphinctes Schimdiwoíf, type-species Ammonites tizianí Omt, is the first genus of this family and is first recorded al the Bifurcatus-Bimammatum Zone boundary in most of the West-Tethys areas. The successive forms of this genus appear fairly well-represented all across the Iberian Range (E Spain), allowing the recognition of many Orthosphinctes biohorizons within the classical biosiratigraphic scheme for the Upper Oxfordian in the Submeditarranean Province. The origin of the genus Subnebrodites at the base of the Planula Zone is proposed from the main Orthosphinctes stem via the 'intermediate', synthetic form O. fontannessi (Chofpaj

Biostratigraphic subdivisions of Bimammatum Biozone (Upper Oxfordian) in the nororiental Iberian Chain: fades and range of discontinuities

Middle to Upper Oxfordian rocks in the northeastern Iberian Chain (Spain) are formed by bioclastic sponge limestones (Yatova Fm.). The development of the sponge facies, however, appears geographically and stratigraphically limited by the development of clastic facies in the western part, and glauconitic limestones in the eastern part of the platform. The dividing palaeogeographic line between both facies seems to separate two distinct areas in the platform during the Middle and Upper Oxfordian: a western part, under the^slight influence of the near emerged massifs, and an eastern, distal part where glauconitic limestones are dominant. This suppossed palaeogeographic line also represents a sharp facies boundary during the Callovian-Oxfordian transition interva

Upper Oxfordian Biostratigraphy and Óxfordian-Kimmeridgian boundary in northeastern Iberian Chain, Tosos-Aguilón (eastern iberia)

Upper Oxfordian Sedimentation in the northeastern Iberian Chain (Tosos-Aguilón area) took place on a middle carbonate ramp during the Bimammatum Zone, progressively submitted to terrigenous input from the próxima!, northwestern area, between Hauffiânum and Calar Subzones. A sharp discontinuity at the Bimammatum Subzone marks thé decline of thé prevailing benthic communities (sponges, crinoids, bràchiopóds). The increasing supply of terrigenous sediments led to a high sedimentation rate values during Piàntila and Calar subzones, and to the development of more restricted environments characterized by the higher présence of bivalves (Sot de Chera Formation). The Hauffianum, Planula and Calar subzones are first characterised by ,ammonites in this area. The sharp stratigraphie discontinuity and facies change located at the Bimammatum Subzone, just below the Hauffianum Subzone, could stand as a clerar, cofrclatàble point to mark the Óxfórdian-Kimmeridgian boundary across the Iberian Basin, as regards the new proposal of the Óxfordian-Kimmeridgian boundary stratotyp

The biospecies concept in ammonites and its bearing on the Systematics and biostratigraphy: The subfamily Perisphinctinare Steinmann 7597 from the Middle Oxfordian of Submediterranean Province

Despite the importance of Perisphinctidae ammonite family as a tool (or biogeographic correlation and biostratigraphy during the Oxfordian, these studies are frequently hampered by the intraspecific morphological and geographical variability, and the traditionally used tipologist species concept. A modern systematics, based on a biological species concept (biospecies) taking into account all types of intraspecific variability is likely to provide a more reliable phyllogenetic-biostratigraphic frame, leading as well to a better comprehension of the biogeographic dynamics of the group. The studied recorded successions in the Middle Oxfordian of Rida (NE Iberian Chain, Spain) known by their abundance and by the completeness of the ammonite record, supply a good evidence for the analysis of intraspecific variability and biospecies concep

The angular unconformity of Moyuela (Zaragoza): remarks on extensional tectonic events at the Oxfordian-Kimmeridgian boundary in the Iberian basin

An angular unconformity has been found at the lower part of the Sot de Chera Fm. near the village of Moyuela (Northern Iberian Chain, NE Spain). This unconformity develops during a tectonic extension at the turn of the Oxfordian-Kimmeridgian stages. Biostratigraphic and taphonomic analyses of the ammonite succession reveal a small statigraphic gap at the top of the Yatova Fm,, partly affecting the Bimammatum and Hauffianum Subzones. The lower part of the overlying Sot de Chera Fm. has been accurately dated as Galar Subzone by the common ocurrence of Sutnerla galar (OPPEL). This provides a precise dating of the tilting phase responsible for the observed angular unconformity. The unconformity of Moyuela confirms previous interpretations about the regional extension of a tectonic event which involved tilting of blocks during the deposition of the Sotde Chera marly Fm. and would give further support to setting the Oxfordian-Kimmeridgian boundary below the Plan u la Zone, at the base of Hauffianum Subzon

Application of hydrochemical and multi-isotopic (87Sr/86Sr, δ13C-DIC, δ2H-H2O, δ18O-H2O) tools to determine contamination sources and processes in the Guadalhorce River Basin, southern Spain

The integrated use of multi-isotopic (87Sr/86Sr, δ13C-DIC, δ2H-H2O, δ18O-H2O) and hydrochemical data was applied in the highly anthropized Guadalhorce river basin, southern Spain, to improve the knowledge about water contamination sources and processes and to achieve improved water resource management. The results obtained highlight the importance of the use of isotopes as tracers of pollutants. DIC, δ2H-H2O, δ18O-H2O and δ13C-DIC allowed differentiating two water recharge end members: direct rainwater, infiltrated into the upper and lower detritic aquifers of the sub-basins, and the Guadalhorce dam system, which act as a source in some groundwater and surface waters of the lower sub-basin. 87Sr/86Sr data supported the existing conclusions in relation to pollution sources in the study area. The Triassic basement (evaporites) of the carbonate and detritic aquifers of the basin generally controls the natural 87Sr/86Sr composition in waters of the upper sub-basin. Only one groundwater sample reflects the influence of a human organic source (sewage) in its composition. On the other hand, mixing of human inorganic (fertilizers and detergents) strontium sources is required to explain the 87Sr/86Sr contents of the lower sub-basin waters. Discriminating the use of domestic detergents as another anthropogenic source of strontium and sulphate in waters is a novel finding in this research. The conclusions reached can be extrapolated to other anthropized basins.Fil: Glok Galli, Melisa. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ingeniería Olavarría; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires; ArgentinaFil: Vadillo Pérez, I.. Universidad de Málaga; EspañaFil: Jiménez Gavilán, P.. Universidad de Málaga; EspañaFil: Ojeda Rodríguez, L.. Universidad de Málaga; EspañaFil: Urresti Estala, B.. Tragsa; EspañaFil: Martinez, Daniel Emilio. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentin